Japanese knotweed dormancy.

Friday 9th February 2018

Japanese knotweed is a funny plant and can easily enter dormancy either wholly or partly. The reasons for it entering dormancy are not well understood, but include herbicide treatment, burial, covering with a barrier or covering with concrete. Basically anything which stops the plant from growing normally has the potential for it to enter dormancy and this dormancy may last years or even decades.

Ive recently had a discussion with a pesticide manufacturer and we believe that weve identified one possible mechanism for inducing apparent dormancy in Japanese knotweed and possibly a few of the key issues that we have to deal with in treating knotweed. This discussion may lead to some experimental work being undertaken however this will be a long project and results may take years to reliably assess. However this work needs to be done and there is a need for continued research in this area to follow on from the excellent field trials carried out by Dr Dan Jones during his studies at Swansea University.

This week, Ive assessed a number of sites, including one in which Japanese knotweed has apparently been lying dormant for nearly 30 years. The rhizome which I examined was large (circa 80mm+ diameter) and was still alive, although it was a deeper orange colour than would normally be expected. Possibly this knotweed was treated many years ago with a residual herbicide, which might explain the long dormant period and the discolouration.

Were already booking surveys and receiving orders for treatment programmes and are able to provide suitable management plans for dealing with your Japanese knotweed or other invasive weeds. So why not call us?

With staff covering all of England & Wales, speak to the professional Japanese knotweed Company about your knotweed problems, contact us on 01327 703129 or 01962 886060 or email us on enquiries@jkweed.co.uk or sharon@jkweed.co.uk